Deltonin, a steroidal
saponin isolated from Dioscorea zingiberensis Wright, exhibits high cytotoxic activity in
cancer cells. In the present study, the effects of
deltonin on cell proliferation and apoptosis were evaluated in the MDA‑MB‑231 human
breast carcinoma cell line. Following treatment with
deltonin, the viability of MDA‑MB‑231 cells was analyzed using MTT assay and apoptosis, mitochondrial membrane potential (∆Ψm) alternation and intracellular
reactive oxygen species (ROS) generation was determined by flow cytometry. In addition, western blot analysis was performed to examine the expression of apoptosis‑associated
proteins. The results demonstrated that
deltonin induced apoptosis in MDA‑MB‑231 cells in a time‑ and concentration‑dependent manner. Apoptosis was associated with depolarization of ∆Ψm and time‑dependent ROS generation.
Deltonin treatment also resulted in Bax upregulation, Bcl-2 downregulation, activation of caspase‑3 and ‑8 and
poly (ADP ribose) polymerase cleavage. Decreased levels of phosphorylated extracellular signal‑regulated
kinase (ERK) and phosphorylated AKT were also observed. Results indicate that the proliferation inhibitory effect of
deltonin is associated with its apoptosis‑inducing effect, which may correlate with ROS‑mediated
mitochondrial dysfunction as well as activation of the ERK/AKT signaling pathways. Therefore,
deltonin may be a potential chemotherapeutic agent for the treatment of
breast cancer.